| Patents for G01R 23 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra (7,503) |
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| 01/05/2011 | CN201698011U Comprehensive tester of portable direct-current system |
| 01/05/2011 | CN201698000U Automatic testing system of radio-frequency power amplifier based on mixed bus |
| 01/05/2011 | CN201697959U Industrial electric energy network node sensor |
| 01/05/2011 | CN101937069A Voltage characteristic detection system and method of SOC (System On Chip) intelligent electric meter |
| 01/05/2011 | CN101937020A Power grid harmonic wave detection device based on artificial neural network |
| 01/05/2011 | CN101937019A Graphic actuation of test and measurement triggers |
| 01/05/2011 | CN101937018A Device and method for monitoring power quality harmonic wave and overvoltage on line |
| 01/05/2011 | CN101006348B Power quality monitory |
| 12/30/2010 | US20100332171 Counting device, physical quantity sensor, counting method, and physical quantity measuring method |
| 12/30/2010 | US20100332165 Method of Estimating Pulse Response Using an Impedance Spectrum |
| 12/30/2010 | US20100327982 Inverting difference oscillator |
| 12/30/2010 | US20100327936 Method and apparatus for determining within-die and across-die variation of analog circuits |
| 12/30/2010 | US20100327888 Method for determining the size and shape measure of a solid material in an arc furnace, an arc furnace, a signal processing device and program code and a memory medium |
| 12/29/2010 | WO2010151183A1 Method and an arrangement for a mobile telecommunications network |
| 12/29/2010 | WO2010149825A1 Spectrum sensing |
| 12/29/2010 | EP2267467A1 Frequency detection device, frequency detection method, circuit control device, circuit control method, delay circuit control method, and delay circuit system |
| 12/29/2010 | CN101931219A Phase deviation based auto-disturbance rejection isolated island detecting method |
| 12/29/2010 | CN101930053A Single-lamp multistate digital transmitting and receiving test pencil |
| 12/28/2010 | US7859346 Clock generator and associated self-test and switching-control method |
| 12/23/2010 | DE202010014605U1 Intermodulationsmessvorrichtung Intermodulation measurement device |
| 12/23/2010 | DE102009035944A1 Verfahren und Vorrichtung zur ereignisgestützten Reduktion des Zeit-Frequenz-Bereichs eines Signals Method and apparatus for event-based reduction of the time-frequency region of a signal |
| 12/22/2010 | EP2264945A2 Communication analysis apparatus and communication analysis method |
| 12/22/2010 | EP2264479A2 Method and device for result-supported reduction of the time-frequency range of a signal |
| 12/22/2010 | CN101923113A Time qualified frequency mask trigger |
| 12/21/2010 | US7856224 Systems and methods for recovering a signal of interest from a complex signal |
| 12/21/2010 | US7855607 Ring oscillation circuit, delay time measuring circuit, testing circuit, clock generating circuit, image sensor, pulse generating circuit, semiconductor integrated circuit, and testing method thereof |
| 12/21/2010 | US7855545 Sinusoidal modulated signal clarification tool using various oscillator systems |
| 12/16/2010 | WO2010144857A2 Method of detecting system function by measuring frequency response |
| 12/16/2010 | WO2010144834A2 Method of estimating pulse response using an impedance spectrum |
| 12/16/2010 | US20100315061 Measurement apparatus and recording medium |
| 12/16/2010 | DE102008037308B4 Signalprofilrekonstruktion Signal profile reconstruction |
| 12/16/2010 | DE10116880B4 Verfahren zum Optimieren des Frequenzaufbereitungszuges eines Hochfrequenz-Überlagerungsempfänger A method for optimizing the frequency processing train of high-frequency heterodyne receiver |
| 12/15/2010 | EP2261681A1 Method of detecting fundamental wave beat component, sampling device for measured signal using the same, and waveform observation system |
| 12/15/2010 | CN201673221U Signal testing platform based on virtual instrument |
| 12/15/2010 | CN101915874A Harmonic wave detection method based on Fourier transformation |
| 12/15/2010 | CN101915873A Single wavelength type microwave frequency measurement scheme adopting orthogonal optical power ratios |
| 12/14/2010 | US7853419 Signal processing circuit and method for processing an HF input signal |
| 12/09/2010 | WO2010141322A1 Analyzing a radio frequency spectrum |
| 12/08/2010 | CN201666215U Comprehensive measuring device for opening and frequency of water turbine speed regulator |
| 12/08/2010 | CN101907660A Handheld device with measuring function and measuring method thereof |
| 12/08/2010 | CN101907648A Electric energy quality online monitoring device |
| 12/08/2010 | CN101515015B Power quality monitoring and recording device of power system |
| 12/08/2010 | CN101241374B Apparatus, system and method for regulating power voltage |
| 12/08/2010 | CN101146307B A frequency spectrum scanning device and its method |
| 12/08/2010 | CN101026781B Quasi full-synchronous high-precision rapid frequency measuring device and method |
| 12/07/2010 | US7848898 Method for monitoring process drift using plasma characteristics |
| 12/07/2010 | US7847644 Modulation signal generation circuit, transmission/reception module, and radar device |
| 12/07/2010 | US7847597 Precision frequency change detector |
| 12/07/2010 | US7847579 Systems and methods to evaluate permanent magnet motors |
| 12/02/2010 | WO2010069414A8 Display of spectra |
| 12/02/2010 | US20100305894 Method and device for determining the frequency distribution of the signal levels of a measured signal measured in overlapping observation intervals |
| 12/01/2010 | EP2257030A1 Communication analysis device and communication analysis method |
| 12/01/2010 | CN1678129B Howling frequency component emphasis method and apparatus |
| 12/01/2010 | CN101900761A High-accuracy non-integer-period sampled harmonic analysis and measurement method |
| 12/01/2010 | CN101897574A Chaotic calculation method of pulse wave velocity |
| 11/30/2010 | US7843228 Half bin linear frequency discriminator |
| 11/25/2010 | US20100299092 Fundamental wave beat component detecting method and measuring target signal sampling apparatus and waveform observation system using the same |
| 11/25/2010 | US20100295623 Systems and methods for calibrating real time clock |
| 11/25/2010 | US20100295622 Systems and methods for self testing a voltage controlled oscillator in an open loop configuration |
| 11/25/2010 | US20100295537 Frequency measuring apparatus |
| 11/25/2010 | US20100295536 Frequency measuring apparatus |
| 11/25/2010 | US20100295535 Frequency measurement device |
| 11/25/2010 | US20100295534 Electromagnetic wave measuring apparatus, measuring method, program, and recording medium |
| 11/25/2010 | US20100295533 Passive intermodulation distortion measuring method and system |
| 11/25/2010 | US20100295531 Measuring device |
| 11/25/2010 | US20100294934 Light measurement apparatus and a trigger signal generator |
| 11/25/2010 | DE102009022056A1 Method for detecting and monitoring electrical alternating voltage in furnace of heating system, involves determining level of voltage based on cycle of pulse-width modulated signal, and comparing level with limit value |
| 11/24/2010 | CN201656762U Voltage detecting circuit for correcting power factor |
| 11/24/2010 | CN201654155U Power quality monitoring management terminal |
| 11/24/2010 | CN201654122U Mobile-type base-wave/harmonic-wave load measurement measuring device |
| 11/24/2010 | CN101893658A Frequency measuring apparatus |
| 11/24/2010 | CN101893657A Frequency measuring apparatus |
| 11/24/2010 | CN101893652A Method for detecting harmonic wave and reactive current based on spatial transformation of voltage vectors |
| 11/24/2010 | CN101893651A Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system |
| 11/18/2010 | US20100289479 Sensor system and method |
| 11/18/2010 | US20100289477 Measuring device and measuring method for measuring the envelope power and the mean-power value |
| 11/17/2010 | EP1881489B1 Mixed audio separation apparatus |
| 11/17/2010 | CN201639555U Output/measurement dual-purpose signal generator |
| 11/17/2010 | CN201637783U Harmonic wave detection device |
| 11/17/2010 | CN101334431B Electric network harmonic frequency spectrum interpolation correction analytical method |
| 11/17/2010 | CN101059547B Diagnostic signal processor |
| 11/16/2010 | US7834643 Systems and methods for reducing distortion in a power source using an active harmonics filter |
| 11/11/2010 | US20100283482 Non-destructive signal propagation system and method to determine substrate integrity |
| 11/10/2010 | EP2249479A1 Time digital converter, digital pll frequency synthesizer, transmitter-receiver, and receiver |
| 11/10/2010 | CN101881796A Frequency counting module and counting method and application |
| 11/10/2010 | CN101437295B Method for detecting perception radio collaboration frequency spectrum based on SNR compare |
| 11/10/2010 | CN101057152B Image cancellation in frequency converters for spectrum analyzers |
| 11/04/2010 | US20100277204 For externally clocked digital audio input, determining a valid clock and muting audio during synchronization |
| 11/04/2010 | US20100277164 Method and apparatus for signal recovery |
| 11/03/2010 | CN101458279B Frequency measurement method by beat method capable of enhancing precision |
| 10/28/2010 | US20100274511 Signal analysis method, signal analysis device and signal analysis program |
| 10/28/2010 | US20100274510 Method of Detecting System Function by Measuring Frequency Response |
| 10/28/2010 | US20100271002 Discharge amount measuring device and method for rotational electric machine |
| 10/28/2010 | US20100271001 Electromagnetic wave measuring apparatus, measurement method, a program, and a recording medium |
| 10/28/2010 | DE102010015226A1 Erfassungsvorrichtung, Berechnungsvorrichtung, Messvorrichtung, Erfassungsmethode, Berechnungsmethode, Übertragungssystem, Programm und Aufzeichnungsträger Detection device, computing device, measuring device, detection method, calculation method, transmission system, program, and recording medium |
| 10/27/2010 | CN101871984A Device and method for detecting electric energy quality of ships |
| 10/27/2010 | CN101871970A Wireless terminal and signal scanning method thereof |
| 10/27/2010 | CN101871969A Frequency spectrum detection method based on characteristic circulation frequency in wireless medical monitoring |
| 10/27/2010 | CN101871968A Reliable time scale pulse measurement method and measurement device thereof |
| 10/27/2010 | CN101871965A Method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals |